Break-up and Coherent Photoproduction of {eta} Mesons on the Deuteron

Journal Article · Sun Jun 01 04:00:00 EDT 1997 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.78.4697· OSTI ID:531856

Hoffmann-Rothe, P; Breuer, M; Hourany, E; Rigney, M; Ajaka, J; Berrier-Ronsin, G; Didelez, J; Rosier, L ^[1]; Hey, J; Anton, G; Beulertz, W; Bock, A; Helbing, K ^[2]; Krebeck, M; Edel, G v; Maass, R; Schumacher, M; Smend, F ^[3]; Blanpied, G; Preedom, B ^[4] ; Richie, B ^[5]; Saghai, B ^[6]; Noeldeke, G ^[7]; Arends, J ^[8]

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1. IN2P3, Institut de Physique Nucleaire, 91406 Orsay (France)
2. University of Erlangen-Nuernberg, Erwin-Romelstreasse 1, D-91058 Erlangen (Germany)
3. Zweites Physikalisches Institut, University of Goettingen, Bunsenstrasse 7--9, Goettingen (Germany)
4. Physics Department, University of South Carolina, Columbia, South Carolina 29208 (United States)
5. Physics Department, Arizona State University, Tempe, Arizona 85281 (United States)
6. CEA/DSM/DAPNIA/SphN, CE-Saclay, 91191 Gif-sur-Yvette (France)
7. Physikalisches Institut, University of Bonn, Nussallee 12, D-53117 Bonn (Germany)
8. Institut fuer Kernphysik, University of Mainz, Joachim-Becher-Weg 45, D-55099 Mainz (Germany)

We present new break-up and coherent data for {eta} meson photoproduction on the deuteron, using a deuterium target and tagged bremsstrahlung photons up to 1GeV. The differential cross sections for the coherent process were measured from threshold to 800MeV. They are much smaller than those previously reported. The break-up channel provides a direct measurement of the neutron to proton differential cross section ratios. At the S{sub 11}(1535) resonance peak, {sigma}{sub n}/{sigma}{sub p}=0.68{plus_minus}0.06 leading to an isoscalar to isovector amplitude ratio of A{sub s}/A{sub {upsilon}}=0.096{plus_minus}0.02 . {copyright} {ital 1997} {ital The American Physical Society}

• OSTI ID: 531856
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 25 Vol. 78; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
ANGULAR DISTRIBUTION
BRANCHING RATIO
BREMSSTRAHLUNG
DEUTERIUM TARGET
DIFFERENTIAL CROSS SECTIONS
ENERGY DEPENDENCE
HELICITY
IMPULSE APPROXIMATION
MESONS
NEUTRONS
PHOTOPRODUCTION
POLARIZATION
PROTONS